C#操作txt文件

在C#中实现操作txt文件，今天因功能需要，实现了在txt文件的指定位置插入指定的内容，代码如下：

1.以下代码是在指定位置插入特定内容（在指定行后面添加新的一行，在指定的字符后面添加特定内容）

　　　　　/// <summary>
        /// Insert information to txt file of the path       
        /// </summary>
        /// <param name="path">the path of txt file</param>
        /// <param name="alias">the lower of information</param>
        private void InsertInfoToFile(string path, string information)
        {
            string alias = information.ToLower();                           //transfer the upper character in information to lower
            string sInsertText = alias + " = (" + information + ")";
            string sText = "";
            System.IO.StreamReader sr = new System.IO.StreamReader(path);
            int iLnTmp = 0;                                                 //store the current line number 
            while (!sr.EndOfStream)
            {
                iLnTmp++;
                string sTmp = sr.ReadLine();                                //store the current line value 
                if (sTmp.Contains("#Insert new information node below"))    //insert PACS new node to config.cfg
                {
                    sTmp += "\r\n" + sInsertText;　　　　　　　　　　　　　　　　//add new row of "sInsertText"
                }
                if (sTmp.Contains("this is the line for alias "))
                {
                    sTmp += ":" + alias;                                    //append alias to "this is the line for alias "
                }
                sText += sTmp + "\r\n";
            }
            sr.Close();                                             
            System.IO.StreamWriter sw = new System.IO.StreamWriter(path, false);
            sw.Write(sText);
            sw.Flush();
            sw.Close();
        }

 

2.以下代码是在特定位置删除指定内容（）

　　　　　/// <summary>
        /// Delete information to txt file
        /// </summary>
        /// <param name="path">the path of txt file contains information you are going to delete</param>
        /// <param name="PacsNodeInfo">alias of information</param>
        private void DeleteInfoFromFile(string path, string information)
        {
            string alias = information.ToLower();
            string sInsertText = alias + " = (" + information + ")";
            string sText = "";
            System.IO.StreamReader sr = new System.IO.StreamReader(path);
            int iLnTmp = 0;                                                     //store the current line number 
            while (!sr.EndOfStream)
            {
                iLnTmp++;
                string sTmp = sr.ReadLine();                                    //store the current line value 
                if (sTmp.Contains(sInsertText))                                 //delete PACS node from config.cfg
                {
                    string lineAfterNode = sr.ReadLine();
                    sText += lineAfterNode + "\r\n";
                    continue;
                }
                if (sTmp.Contains("this is the line for alias "))
                {
                    string temp = ":" + alias;
                    sTmp = sTmp.Replace(temp, " ");                             //replace the certain content by space(delete it)
                }
                sText += sTmp + "\r\n";
            }
            sr.Close();
            System.IO.StreamWriter sw = new System.IO.StreamWriter(path, false);
            sw.Write(sText);
            sw.Flush();
            sw.Close();
        }